error: unrecognized command line option '-Wshorten-64-to-32' error: command '/usr/local/bin/gcc-5' failed with exit status 1

[GovindaPaliwal]

OS: macos mojave
$ which gcc-5
output: /usr/local/bin/gcc-5

$python setup.py build_ext --inplace
Error: error: unrecognized command line option '-Wshorten-64-to-32' error: command
'/usr/local/bin/gcc-5' failed with exit status 1